Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-10-14
1978-07-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250211K, G01D 534
Patent
active
041031555
ABSTRACT:
The present invention pertains to a system used in conjunction with a rotary member such as a shaft to sense the angular position of the rotary member and produce an output signal which is a function thereof. The signal is received by operator means for producing a programmed response to the signal. The system comprises a light reflective program carried by the rotary member, its length extending in a circumferential direction with respect to the rotary member and its width varying along its length as a function of lengthwise distance from one end of the program area. The system further comprises means for projecting light onto at least a part of the program area over an extent transverse to the program area at least as broad as the maximum width of the program area and primary detector means operative to detect the amount of light being reflected from the entire width of a limited lengthwise portion of the program area aligned with the primary detector means. The primary detector means is disposed opposite the program area whereby successive lengthwise portions of the program area will pass the primary detector means as the rotary member is rotated, the primary detector means being operative to produce the output signal.
REFERENCES:
patent: 2480134 (1949-08-01), Harrington
patent: 3358150 (1967-12-01), Summer
patent: 3399347 (1968-08-01), Martens
patent: 3566132 (1967-12-01), Walker
patent: 3846701 (1974-11-01), Sampey
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